Marathon -- U.S. County in Wisconsin Population (2000): 125834 Housing Units (2000): 50360 Land area (2000): 1544.961790 sq. miles (4001.432497 sq. km) Water area (2000): 31.179336 sq. miles (80.754105 sq. km) Total area (2000): 1576.141126 sq. miles (4082.186602 sq. km) Located within: Wisconsin (WI), FIPS 55 Location: 44.900795 N, 89.738490 W Headwords: Marathon Marathon, WI Marathon County Marathon County, WI